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(No Model.)

A. OALDWELL SOCKET TIP FOR FLEXIBLE TUBING.

No. 450,139. Patented Apr. 14,1891.

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UNITED STATES PATENT OFFICE.

ALFRED CALDIVELL, OF PROVIDENOE, RIIODE ISLAND.VV

SOCKET-TIP FOR FLEXIBLE TUBlNG.

SPBCIFICATION forming' part of Letters Patent No. 50,139, dated April 14, 1891'. Application filed December 9,1889. Serial No. 333,107. (No-modem To aZZ whom it may concern:

Be it known that I, ALFRED CALDWEL,

' residing at Providenoe, in the State of Rhode ing a port-ion of it; but in such construction the smaller portion, to which the flexible tube is to be secured, must be made so thin that in sorewing it into the end of a tube Vit is liable to break, and especially as its exterior must be provided with screw-threads to cause it to enter the end .of the tube. Although it is primarily intended to be used with a tube having a spiral-wire foundation, which forms a screw-thread into which the screw-threads of the socket could enter, it

frequently happens that it is desirable to fasten the socket to a fiexible tube that is not provided with any interior screw-thread, and the screw-thread of the socket must form its own threads. In such cases it requires considerable force to make the small portion of the socket enter the tube, and as a consequence the thin vulcanized shell is Very apt to crack or break. To obviate this defect I find it necessary to provide the socket with a more substantial portion than a Vulcanized rubber shell in which to cut the sorewthreads, and for this purpose I make use of a short metallic attaching-piece, which is vulcanized to one end of the rubber socket, while the remaini'ng portion of the socket which is to slip over the pipe or gas-jet is left soft and elastic.

Referring to the accompanying drawings, in which the same reference-letters indicate corresponding parts in each of the views, Fi gure l is a longitudinal sectional view of my socket-tip. Fig. 2 is a side view of the same, and Fig. 8 is an end view.

The tip A is preferably formed of two short tubes b and c, the tube b being of metal and provided with exterior screw-threads cl, and the tube c being of rubber, into one end of which the tube b is secured. After the end of the metallic tube has been forced into the end of the soft-rubber tube as far as desired the two pieces are placed intoa suitable mold and the portion of the rubber which surrounds the metallic tube and is in direct contact with it is vulcanized. This Vulcanization of the rubber causes it to adhere very firmly to the metallic tube, so that it is impossible to separate them under ordinary circumstances, and yet it leaves the free or outer end of the rubber in its soft and fiexible condition, so that it can be placed over the end of another tube or gas jet7 even if the tube is of a larger diameter than the interior diameter of the rubber tube. As the vulcanized portion of the rubber is so firmly attached -to the metallic tube, there is no danger of cracking or breaking iL by stretching the liexible portion over a larger tube, as might be done if there were no rigid metallic portion, as in my forrner patent; and with a metallic tube having screw-threadsd upon its exterior the socket can be secured to a fiexible tube of substantially the same or less diameter, even though it has to make its own threads as it goes, although I prefer using it with a tube B, having a spiral Wire e for its foundation,.the coils of which form threads which take into 'the threads of the tube b and hold the two securely together. Wfith a metallic sorewthreaded tube there is no danger of breaking the socket in forcing it into the end of a small tube, as there Would be if the whole socket were made out of rubber, with one end of it rcduced to a mere Shell and that portion then vulcanized, .and at the same time the fiexibility of the unvulcanized por- ALFRED OALDWELL.

Witnesses:

SooRA'rEs SOHOLFIELD, H. S. BABcooK.

IOO 

